Continuous preparation method of large-area single-crystal (100) copper foil

A continuous preparation method of a large-area (100) single-crystal copper foil, wherein a commercial poly-crystal copper foil is connected to a reel-to-reel device, a carbon-based substrate is placed below the commercial poly-crystal copper foil, strain energy in a growth process of the single-crystal copper foil is controlled to be dominant by applying a stress in a heat treatment process in a reducing/productive atmosphere under an environment with a temperature gradient, so as to make the strain energy become a main influence factor of grain boundary migration and lattice rotation, and then the large-are (100) single-crystal copper foil is prepared;

• and the preparation method comprises the following steps:
• step 1:
• pretreating the commercial poly-crystal copper foil to remove an organic layer, an oxide layer and impurities;
• step 2:
• connecting the pretreated commercial poly-crystal copper foil to the reel-to-reel device to send the copper foil into a multi-temperature-zone tube furnace, and using the carbon-based substrate placed on a corundum plate or a quartz plate as a support below the commercial poly-crystal copper foil;
• step 3:
• vacuumizing an interior of the multi-temperature-zone tube furnace, and introducing reducing/protecting gas to reach a preset pressure;
• and
• step 4:
• heating the copper foil under the condition of continuously introducing the reducing/protecting gas until a highest temperature in a center of the copper foil is 980° C. to 1070° C., applying a stress of 80 N to 100 N per square centimeter of cross-sectional area by tightening reels of the reel-to-reel device for 10 minutes to 30 minutes, subjecting the copper foil to heat preservation for 4 hours to 15 hours at the same time, and naturally cooling the copper foil to room temperature, so as to obtain the (100) single-crystal copper foil.